Android graphics mem drops when HWCPipe is enabled

[Hy9996]

Hi there, we are using HwcPipe analyzing GPU performance of our game, and we found that on the MTK 9200 chip, a sudden GPU memory drop occurs after calling start_sampling(). This issue was not observed on other platforms, including the MTK 9300.

Our device: Vivo X90

[solidpixel]

What tool is this measured with? The Android Studio memory profiler?

We don't have a good explanation for why this happens - the context used for counter sampling is completely separate to the main application rendering context, so the shouldn't be any direct effect. The counter context itself obviously allocates a bit more memory for the counter buffers, but it should be minor.

[Hy9996]

Yes, the picture posted above is from Android Studio, we also tried to collect the memory data directly from the java api("summary.graphics" in Debug.MemoryInfo), but shows the same result.

[solidpixel]

Thanks for confirming - I'll see if the GPU driver team have any ideas that can explain this one.

[solidpixel]

Closing - old issue, we could not explain or reproduce on our devices.